Allen-Bradley micrologix 1500, Руководство пользователя

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Publication 1764-UM001A-US-P
Using Trim Pots and the Data Access Tool (DAT) 5-5
Power Save Timeout (PST) Parameter
The power save timeout turns off the DAT display after keypad activity has
stopped for a user-defined period of time. The power-save (DAT:0.PST) value is set
in the DAT Function File. The valid range is 0 to 255 minutes. The power-save
feature can be disabled by setting the PST value to 0, which keeps the display on
continuously. The default value is 0.
In power-save mode, a dash flashes in the left-most segment of the display. Press
any key (except F1 or F2) to return the DAT to its previous mode. If F1 or F2 is
pressed, the DAT will change the value of the F1 or F2 status bits, but the display
remains in power-save mode.
Understanding the DAT Display
When the DAT enters either the bit or integer mode, the element number and its
data are displayed, as shown below. The element number is either the integer or bit
location.
If the displayed element is defined in the controller’s data file, and is not protected,
the element number flashes, indicating that it can be modified. If the displayed
element is protected, the PROTECTED indicator light illuminates, and the
element number does not flash, indicating that the element cannot be modified.
If the element is undefined, the data field displays three dashes. The element
number does not flash because the element does not exist.
F1
BIT
F2
INT
ESC
ENTER
PROTECTED
2 1
3 2 7 6
-
8
F1
BIT
F2
INT
ESC
ENTER
PROTECTED
0 0
o f f
-
0
bit element
number
• 0 to 47
bit data
• OFF - 0
• ON - 1
• – – – (undefined)
integer
element
number
• 0 to 47
integer data
• -32,768 to 32,767
• – – – (undefined)
Bit Mode Display Integer Mode Display
AB Spares